In the rich text editor:
@Igoripl
In a comment:
[Igoripl](https://chowlings.com/user/Igoripl)
For Names and Avatars:
In the rich text editor:
%Igoripl
In a comment:
[![Igoripl's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Igoripl) [Igoripl](https://chowlings.com/user/Igoripl)